Newly discovered comet is likely interstellar visitor

A newly discovered comet has excited the astronomical community this week because it appears to have originated from outside the solar system. The object—designated C/2019 Q4 (Borisov) - was discovered on Aug. 30, 2019, ...

How do we know there's a Planet 9?

At this point, I think the astronomy textbook publishers should just give up. They'd like to tell you how many planets there are in the solar system, they really would. But astronomers just can't stop discovering new worlds, ...

Ghosts of the future: First giant structures of the universe

(PhysOrg.com) -- Astronomers using the South Pole Telescope report that they have discovered the most massive galaxy cluster yet seen at a distance of 7 billion light-years. The cluster (designated SPT-CL J0546-5345) weighs ...

What is the Kuiper Belt?

Dr. Mike Brown is a professor of planetary astronomy at Caltech. He's best known as the man who killed Pluto, thanks to his team's discovery of Eris and other Kuiper Belt Objects. We asked him to help us explain this unusual ...

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